Super River Tools · v1.2.0

在线工具 / Online Tools

40 多个免费实用的在线工具：图片压缩到指定大小、证件照、PDF 合并、房贷计算、JSON、Base64、字数统计等。无需注册，多数工具在浏览器本地处理。

40+ free online tools: compress images to a target size, ID photos, PDF merge, mortgage calculator, JSON, Base64, word count and more. No sign-up; most tools run locally in your browser.

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在线图片压缩

Reduce JPG, PNG and WebP file size. PNG uses lossless optimization; images are processed temporarily on the server.

图片格式转换

Convert JPG, PNG, WebP, BMP, static GIF and single-page TIFF images.

图片尺寸调整

Resize JPG, PNG and WebP images to specific pixel dimensions, with optional aspect-ratio locking.

在线图片裁剪

Crop images freely or use a fixed aspect ratio locally in your browser.

在线图片旋转

Rotate static images by any angle or use 90° shortcuts, entirely in your browser.

在线 Markdown 编辑器

Write, preview and save Markdown, insert tables or export a PDF with selectable text.

Markdown 转 PDF

Upload UTF-8 Markdown, choose A4 orientation, margins and page numbers, and export PDF.

免费在线 PDF 合并

Reorder and combine ordinary PDFs, preserving page sizes and selectable text without uploading.

免费在线 PDF 拆分与页面提取

Extract selected PDF pages or save every page as a separate PDF in a ZIP archive.

在线 PDF 页面排序、删除与旋转

Preview thumbnails, reorder or delete pages and rotate them before exporting a PDF locally.

图片转 PDF

Arrange images and create a PDF with A4, Letter or image-sized pages.

免费二维码生成与美化

Create static QR codes for URLs, text, Wi-Fi, contacts, email, phone and SMS. Apply a style preset, add text and download PNG or SVG.

在线文本比较

Compare two texts side by side or in a unified view, with line and character differences and Chinese support.

Markdown 表格生成

Paste spreadsheet cells or import CSV / TSV, edit values and generate a Markdown table.

JSON 格式化、校验与压缩

Validate JSON, format indentation or minify output while preserving large integers and precise numbers.

JSON、YAML 与 CSV 在线转换

Convert JSON and YAML, or JSON and CSV locally, with validation and downloadable output.

照片 EXIF 查看与 GPS 信息清理

Inspect JPG and PNG camera and location metadata, then re-encode locally to remove personal metadata.

图片文字识别

Recognize Chinese and English in screenshots or scanned images, then copy text or download TXT locally.

图片压缩到指定大小

Shrink photos below 20KB, 50KB, 100KB or any size you need for exam or ID uploads. Batch support; runs locally in your browser.

证件照尺寸调整与换底色

Crop photos to passport, visa and 1-inch / 2-inch sizes, swap a plain background for white, blue or red, and export a single photo or a 4×6 print sheet.

HEIC 转 JPG

Batch convert iPhone HEIC / HEIF photos to JPG or PNG that open everywhere. Runs locally without uploading.

图片加水印

Batch add text watermarks to ID copies or artwork with tiling, angle, opacity, color and position. Processed locally.

Favicon 生成器

Create favicon.ico (16/32/48), an Apple touch icon and 192/512 PNGs from one image, with ready-to-copy HTML.

房贷计算器

Calculate monthly payments and total interest, compare equal-payment and equal-principal schedules, and view the full amortization table.

贷款利率计算器

Find the true annual rate from the amount, term and installment, or compute the installment from a rate, to reveal the real cost of “low fee” plans.

个人所得税计算器

Estimate China's monthly salary withholding tax and take-home pay under the cumulative method, with social insurance and special deductions, for all 12 months.

复利计算器

Calculate the future value of a lump sum plus monthly contributions with compound interest, and chart growth year by year.

BMI 计算器

Calculate BMI from height and weight, see the WHO or Chinese category, and estimate BMR and daily calorie needs.

日期计算器

Count days, weeks and months between dates, add or subtract days, and count weekdays excluding weekends.

Base64 编码解码

Encode and decode Base64 with UTF-8 support, URL-safe output, and file or image to Data URI.

URL 编码解码

URL-encode or decode text and break query strings into a table to debug links and garbled characters.

时间戳转换

Convert Unix timestamps to dates and back, auto-detect seconds vs milliseconds, and show local, UTC and ISO 8601 formats.

正则表达式测试

Test JavaScript regular expressions live with highlighted matches, capture groups, flags and replacement preview.

哈希与 UUID 生成

Compute MD5, SHA-1, SHA-256 and SHA-512 for text or files to verify downloads, and generate UUID v4 in bulk.

JWT 解析

Decode a JWT header and payload, pretty-print the claims, and convert exp, iat and nbf to readable dates with expiry status.

Cron 表达式解析

Translate cron expressions into plain language and list the next 10 run times. Supports Linux, Spring, Quartz and AWS formats.

字数统计

Count words, CJK characters, characters with and without spaces, paragraphs, lines and reading time as you type.

大小写转换

Convert text to UPPER, lower, Title or Sentence case and to camelCase, PascalCase, snake_case, kebab-case and more.

文本去重排序

Remove duplicate and blank lines, trim spaces, sort alphabetically, numerically or by Chinese pinyin, reverse or shuffle lists.

繁简转换

Convert between Simplified and Traditional Chinese, including Taiwan and Hong Kong variants and phrases, powered by OpenCC.

随机密码生成器

Generate strong random passwords with custom length, letters, numbers and symbols, exclude look-alike characters, and see the strength.